Chamfering machine



Aug. 11, 1959 o. CARLSEN ETAL 2,898,813

CHAMFERING MACHINE Original Filed Oct. 18, 1954 2 Sheets-Sheet 1INVENTORS LEONARD o. CARLSEN Y HERMAN A.MALE

FIG-6 ATTORNEY g- 11, 1959 L. o. CARLSEN ET AL 2,898,813

CHAMFERING MACHINE 2 Sheets-Sheet 2 Original Filed Oct. 18; 1954 FIG?)I84 use I 7 I 175 no I83 I79 I76 I82 7o OPEN I85 70 CLOSED I v I86 I87F|G.5 use FIG.4

INVENTORS 8 QAWIQJM ATTORNEY CHAMFERING MACHINE Leonard 0. Carlson,Rochester, and Herman A. Male,

Brighton, N.Y., assignors to The Gleason Works, Rochester, N.Y., acorporation of New York Original application October 18,1954, Serial No.462,660, now Patent No. 2,782,689, dated February 26, 1957. Dzii'idedand this application July 11, 1955, Serial No. 5 ,260

7 Claims. (Cl. 90-1.4)

The present invention relates to a machine for chamfering gears andsimilar toothed parts, especially but not exclusively spiral bevel andhypoid pinions, after the teeth thereof have been cut. In its preferredform the machine is adapted for use in connection with, or as a part of,a gear cutting machine having an automatic loading mechanism, asdisclosed in our patent application Serial No. 462,660, filed October18, 1954, Patent No. 2,782,689, February 26, 1957, of which the presentinvention is a division.

According to the present invention the chamfering machine comprises ahousing, a spindle journaled in said housing and adapted to support atoothed workpiece, an arm carrying a tool, said arm being mounted on thehousing for angular oscillation and also for translation about the axisof oscillation, and a power driven mechanism for oscillating the arm andalso for feeding the 7 arm along said axis in predetermined relation tosuch oscillation to thereby cause the tool to take successive cuts ofpredetermined thickness on the workpiece.

The foregoing and other aspects of the invention, and

the advantages thereof, will appear further from the 7 followingdescription made with reference to the drawings, wherein:

Fig. 1 is a plan view of the machine partly in hori- ,zontal section;

Fig. 2 is a view partly in elevation and partly in vertical section inplane 2-2 of Fig. 1 and in planes parallel thereto;

Fig. 3 is a view in vertical planes'perpendicular to Fig. 2;

Fig. 4 is a horizontal sectional view taken .in plane 44 of Fig. 2;

Fig. 5 is a diagram illustrating the operating cycle of the machine;and, V

Fig. 6 is a simplified wiring diagram of the machine.

The particular machine that is illustrated comprises a housing 157 whichis adjustable along a vertical way 158 on the work head column 37 of aspiral bevel and hypoid pinion generating machine. This adjustment iselfected by means of an adjusting screw 159, for the purpose of aligningthe chamfering. mechanism with a loading attachment on the generatingmachine. After such adjustment is made the housing 157 is firmly clampedto the column 37 by tightening clamp bolts 161. Mounted on the housingis a drive motor 162 which through a gear reduction comprising a worm163 and a wormwheel 164 rotates a cam 165. This cam is mounted in thehousing on anti-friction bearings and has a peripheral cam track 166 fora roller 167, the latter being mounted on the inner end of chamferingarm 49. Two chamfering tools 50 and 51 are adjustable on the arm so thatthey may be positioned to simultaneously chamfer the sharp edges at boththe large and small ends of the teeth of the workpiece, hypoid pinion P.Thus tool 50 in its broken line position in Fig. 1 chamfers edge p atthe large end of one tooth while tool 51 chamfers edge p at the smallend of an approximately diametrically opposite tooth. See also Fig. 2.The arm is mounted on a shaft 168 which is journaled in the housing forboth angular and axial motions, and is partially supported by aspring-backed axial thrust bearing 169. Axial (vertical) motion of theshaft 168 is controlled by a lever 171 which has a forked end carryingrollers that engage in an annular groove 172 in the shaft. The lever,which is fulcrumed on the housing by pin 173, also carries a roller 174engaged in a peripheral track 175 of cam 165. The shape of tracks 166and 175 of cam 165, and their effective phase relationship, is indicatedin the diagram, Fig. 5. The cam makes one turn to completely charnferthe ends of each tooth. During this turn the track 166 eifects fourcutting strokes and four return strokes of the arm 49, the latter beingin its forward position shown in broken lines in Fig. 1 at the pointswhere track 166 touches line 176 in Fig. 5, and being fully retracted toits full line position in Fig. 1 where the track touches line 177 inFig. 5. Preceding each cutting stroke the arm is fed axially by camtrack 175, lowered in this case, so that the tools 50, 51 will removestock from the work. Preceding each return stroke of the arm the track175 effects an axial return feed so that the tools will clear the cutsurfaces as they return. After the fourth cutting stroke track 166swings the .arm to its fully retracted position wherein it dwells whilethe work is indexed to bring successive teeth into position forchamfering; and the track 175 returns the arm axially to its initialraised position. As shown in Fig. 5 the first cutting stroke and thelast return stroke of arm 49 are relatively long, to meet therequirement that the tools retract to a position clear of the path of atransfer member, shown in aforementioned application Serial No. 462,660,which carries the workpiece P to and from the chamfering machine.

Rotating with cam 165, Fig. 4, is a cam for 0p-- erating a switch forcontrolling the motor 162, and also a bevel gear 179 which drives atubular pinion 181. This pinion is journaled for rotation in housing 157and is splined to a shaft 182 which is both rotatable and axiallymovable. The shaft is journaled in a sliding block 183 which has a camfollower roller 184 in a continuous cam track 185 formed in the end faceof cam 165. Affixed to the lower end of the shaft is a disc cam 186carrying a Geneva index drive pin 187 which is periodically engageablein radial slots 188 of a Geneva index plate 189 which rotates as a unitwith the workpiece P. The number of slots 188 corresponds to the numberof 'teeth on the workpiece, and the plate also has a like '185, whichholds the shaft 182 in the position shownin Fig. 4 in which the cam disc186'is offset from the plane of the dog-carried roller 194 and pin 187is offset from the plane of index plate 189. Accordingly the parts 186,187 rotate idly and spring means holds dog 192 engaged in one of theindex plate notches 191.

When the swinging motion of the arm is completed, 7

i.e. during the portion of the cycle designated Index in Fig. 5, camtrack 185 moves the shaft 182 axially, so that disc 186 and pin 187 arebrought into the respective planes of roller 194 and plate 189.Accordingly during the next revolution of shaft 182 the pin enters aslot 188 and advances the plate and the workpiece by one circular pitch.Just before the pin commences to drive the index plate the cam 186 actsthrough roller 194 to lift the dog from recess 191, and just before thepin leaves the slot 188 the cam allows the dog to drop into the nextnotch.

Each such indexing operation is succeeded by chamfering strokes of tools50, 51, the motor 162 rotating the drive cam 165 continuously until allthe teeth of the workpiece have been chamfered. At this time the maincam 165 has made as many revolutions as there are teeth on theworkpiece, and a button 196, Figs. 2 and 3, on the index plate now actsthrough a pivoted arm 197 to open a switch 190 for stopping the motor.

As shown in Fig. 1, the index plate is secured to the chamfering devicework spindle 198 which is rotatable in the housing 157 on anti-frictionbearings 199. Slidable in a cylinder in the spindle is a piston 200secured to a collet 201 which has a split outer end 202 having a conicalouter surface and a cylindrical inner surface. This inner surface isadapted to receive the shank ,of the work pinion P while the conicalouter surface is received in a tapered bore of the spindle so that uponinward movement of the piston, effected by hydraulic pressure appliedthrough passage 203, the split end of the collet is contracted totightly grip the, workpiece and draw its shoulder S firmly against aseat 204 in the spindle. Upon reversal of the hydraulic pressure, i.e.by applying it through passage 205, the piston and the collet 201, 202are moved forwardly to free the workpiece. A suitable system, not shown,comprising a source of fluid under pressure and a reversing valve, isconcerned to the passages 203 and 205.

The simplified electrical system shown in Fig. 6 comprises, in additionto the machine operated switches 170 and 190 and the motor 162, a motorcontroller comprising winding CM and normally open contacts CM-l which,when the winding CM is energized, close to connect the motor to leads LL and L of a three-wire current supply system. There is also a controlswitch 266.

To operate the machine a workpiece P is inserted in the spindle 198,with its teeth properly aligned with the cutting tools 50, 51; and ischucked by application of hydraulic pressure through passage 203. Thenthe switch 266 is momentarily closed (switches 170 and 190 both beingopen at this time), establishing a circuit from L to L throughcontroller winding CM. This causes contacts CM-l to close and the motor162 to operate. Almost immediately the switch 170 is closed by cam 160,so that the circuit through the controller winding CM is maintaineddespite subsequent opening of switch 266. The motor continues tooperate, causing a chamfering operation succeeded by an indexingoperation, as previously described. During the first indexing operationthe button 196 is moved from beneath the arm 197, allowing switch 190 toclose, shunting. switch 170 so that when the latter opens at the end ofthe indexing operation the circuit through winding CM is stillmaintained and motor 162 continues to run. Indexing is followed bychamfering, and so on, until all of the teeth of the workpiece P havebeen chamfered, the switch 170 opening and closing without effect. Then,during the last indexing operation, the button 196 again passes beneatharm 197, opening switch 190, and at the conclusion of this indexoperation, when switch 170 is opened by cam 160, the circuit throughcontroller CM is broken, stopping the 4 motor. Pressure is now releasedfrom passage 203 and applied to passage 205, thereby causing dechuckingof the workpiece which may then be removed from the work spindle.

Having now described the preferred embodiment of our machine, and itsmode of operation, what we claim as our invention is:

1. A chamfering machine or the like comprising a housing, a spindlejournaled in said housing and adapted to support a toothed workpiece, anarm carrying a tool, said arm being mounted on the housing for angularoscillation and also for translation along the axis of oscillation, anda power driven mechanism for oscillating the arm and also for feedingthe arm along said axis in predetermined relation to such oscillation tothereby cause the tool to take successive cuts of predeterminedthickness on the workpiece.

2. A machine according to claim 1 in which said power driven mechanismis arranged to effect a reverse feed motion of the arm preceding eachnon-cutting swing thereof to cause the tool to clear the work duringsuch swing.

3. A machine according to claim 1 in which said mechanism foroscillating the arm comprises a cam having a continuous cam trackthereon, said track being formed to provide a plurality of relativelyshort strokes of the arm for cutting and a relatively long stroke toswing the arm clear of the cutting zone after the last cutting stroke.

4. A machine according to claim 1 in which said power driven mechanismcomprises a cam rotatable in the housing, said cam having one cam trackfor effecting a plurality of oscillations of the arm during eachrevolution, and said cam having a second cam track for effecting feed ofthe arm, so that on each cutting stroke of the arm additional stock isremoved from the workpiece, and also for. effecting return feed of thearm following the last cutting stroke.

5. A machine according to claim 4 in which the second cam track isarranged for effecting a reverse feed of the arm following each cuttingstroke to cause the tool to clear the work during the succeeding returnstroke.

6. A machine according to claim 1 in which there is a means, operatingin time with said power driven mechanism and adapted to periodicallyindex the spindle to bring successive teeth of a workpiece into cuttingposition.

7. A machine according to claim 6 in which the means for oscillating andfeeding the arm comprises a cam rotatable in the housing, said camhaving three continuous cam tracks of which one effects oscillation ofthe arm, the second a feed motion of the arm followed by a return motionto return the arm to its initial axial position, and the third theoperation of said index means.

Colliau Mar. 28, 1922 Haas May 29, 1934

